Is there a way to change the “Home Header / Header Widget” to show an image instead of having a Header Widget Title, Header Widget Subtitle, and Header Widget Link Label and keep only the Header Widget Link.
Unfortunately, there is no way to use image through theme settings. But you can add an image by the code. If you use child theme then copy header.php from the parent theme into the child theme. And after the line #203, you can add an image tag. See the screenshot for a reference.